What's the best method for cleaning out used, plastic pots? And by used I mean I am not exactly sure how long they have been sitting around and what was in them beforehand.
This summer I used some pots for other plants that my local garden center was going to recycle anyways. I cleaned with a bleach solution and rinsed A LOT before planting...but I wasn't sure whether bleach would be harmful to CPs specifically. Thanks!